From a purely British-biased standpoint, I'm glad the Empire separated the wheat from the chaff by allowing to go free all the dominions and territories who wanted independence from the Empire. Hopefully in this rather extremely socially turbulent TL, it should give the Empire a level of security against inside agitation that most countries can only dream of.
Yes the two UKs are bastions of stability in this turbulent world, though much of Europe and the Americas have settled down. Thus the UKs are turning out to be the top players in the world of D-459, especially in the new frontier of space.
Interesting, though. Panslavia rises again after being comprehensively beaten only a few years ago. Do you intend this to be the dying remnants of a philosophy which now knows it can only exist in Slavic territory, or is this the first sign that Panslavism is actually an international agent of change which, like Communism OTL, is unlikely to cease to be a major global influence (or threat, depending on your standpoint) for centuries to come?
In the case of the Technocratic occupied states it's a case of extreme martial law as the Germans aren't exactly friendly to those who had tried to kill them all, especial as those western Slav states were the most fanatical during the war. In the former Russia it's more simply that the Panslavists have the best connections left over for a rebellion and they are much lest ideological.